CN113356962A - Engine oil liquid level monitoring system and operation method thereof - Google Patents
Engine oil liquid level monitoring system and operation method thereof Download PDFInfo
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- CN113356962A CN113356962A CN202110748863.7A CN202110748863A CN113356962A CN 113356962 A CN113356962 A CN 113356962A CN 202110748863 A CN202110748863 A CN 202110748863A CN 113356962 A CN113356962 A CN 113356962A
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- liquid level
- engine oil
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- pressure sensor
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- 239000007788 liquid Substances 0.000 title claims abstract description 120
- 239000010705 motor oil Substances 0.000 title claims abstract description 94
- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 27
- 238000012937 correction Methods 0.000 claims abstract description 39
- 238000001914 filtration Methods 0.000 claims abstract description 27
- 239000003921 oil Substances 0.000 claims description 37
- 238000012545 processing Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 2
- 239000010721 machine oil Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
- F01M11/12—Indicating devices; Other safety devices concerning lubricant level
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/18—Indicating or safety devices
- F01M1/20—Indicating or safety devices concerning lubricant pressure
Abstract
An engine oil level monitoring system comprises an ECU (electronic control Unit), a first pressure sensor arranged at the bottom of an engine oil pan and a second pressure sensor arranged on an engine air valve chamber cover, wherein the ECU comprises an engine oil level initial value calculation module, a liquid level correction module and a delay filtering module. By the aid of the design, accurate measurement of engine oil liquid level under common road conditions is realized, and measurement accuracy under the working condition of bumpy road surfaces is improved.
Description
Technical Field
The invention belongs to the field of engine oil level measurement of automobile engines, and particularly relates to an engine oil level monitoring system and an operation method thereof.
Background
The engine oil, namely engine lubricating oil, can play roles in lubricating, antifriction, auxiliary cooling, sealing, rust prevention, corrosion prevention and the like for the engine. When the engine oil amount is too small, the problem that the engine is lack of lubrication and breaks down easily occurs, and even the engine is damaged by cylinder pulling in a serious condition, so that the effective monitoring of the engine oil level has a very important function.
At present, electric control engines are widely adopted for vehicle engines, and a plurality of electric control engines only rely on an oil dipstick to check the liquid level, so that the condition of forgetting the check is easy to occur, and a driver cannot detect the oil level in the driving process, which is not beneficial to fault detection in the running process of the engine. Some engines can adopt an engine oil level sensor to monitor the engine oil level, and although the engine oil level sensor can monitor the engine oil level in the driving process, the method has high cost, poor precision and high failure rate.
Disclosure of Invention
The invention aims to provide an engine oil liquid level monitoring system with low cost and high precision and an operation method thereof aiming at the problems in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an engine oil liquid level monitoring system comprises an ECU control unit and a first pressure sensor arranged at the bottom of an engine oil pan;
the monitoring system further comprises a second pressure sensor arranged on the engine air valve chamber cover cap, the ECU control unit comprises an engine oil liquid level initial value calculation module and a liquid level correction module, the signal input end of the engine oil liquid level initial value calculation module is connected with the signal output end of the first pressure sensor, and the signal output ends of the engine oil liquid level initial value calculation module and the second pressure sensor are connected with the signal input end of the liquid level correction module.
The ECU control unit also comprises a delay filtering module, and the signal input end of the delay filtering module is connected with the signal output end of the liquid level correction module.
The ECU control unit also comprises a liquid level alarm module, and the signal input end of the liquid level alarm module is connected with the signal output end of the delay filtering module;
the liquid level alarm module is used for comparing the engine oil liquid level output by the delay filter module with an engine oil liquid level alarm limit value in real time, sending an alarm prompt when the engine oil liquid level is lower than a first gear alarm limit value, and sending an engine torque limiting prompt when the engine oil liquid level is lower than a second gear alarm limit value.
The first pressure sensor and the second pressure sensor are MEMS sensors.
An operation method of an engine oil liquid level monitoring system sequentially comprises the following steps:
converting a signal acquired by a pressure sensor in real time into an engine oil liquid level initial value by an engine oil liquid level initial value calculation module through a pre-calibrated pressure-liquid level MAP;
and step two, the liquid level correction module corrects the initial value of the oil liquid level by combining the signals collected by the second pressure sensor to obtain the corrected oil liquid level value.
The second step is specifically as follows: the liquid level correction module converts a voltage signal acquired by the second pressure sensor into an absolute pressure value through a pre-calibrated voltage-absolute pressure MAP, determines a liquid level correction amount according to the absolute pressure value, and finally takes a difference value between an engine oil liquid level initial value and the liquid level correction amount as a corrected engine oil level value.
The ECU control unit also comprises a delay filtering module, and the signal input end of the delay filtering module is connected with the signal output end of the liquid level correction module;
the operation method further comprises the following steps:
and step three, when the vehicle runs on a bumpy road surface, the delay filtering module carries out delay processing on the corrected oil level value, namely, the average value of the corrected oil level value in a set time period is used as an output value.
The ECU control unit also comprises a liquid level alarm module, and the signal input end of the liquid level alarm module is connected with the signal output end of the delay filtering module;
the operation method further comprises the following steps:
and step four, the liquid level alarm module compares the output value of the delay filter module with an engine oil liquid level alarm limit value in real time, gives an alarm prompt when the oil liquid level is lower than the first gear alarm limit value, and sends an engine torque limiting prompt when the oil liquid level is lower than the second gear alarm limit value.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to an engine oil level monitoring system which comprises a first pressure sensor arranged at the bottom of an engine oil pan and a second pressure sensor arranged on a valve chamber cover of an engine, wherein an ECU (electronic control Unit) control unit comprises an engine oil level initial value calculation module and a liquid level correction module, the signal input end of the engine oil level initial value calculation module is connected with the signal output end of the first pressure sensor, the signal output ends of the engine oil level initial value calculation module and the second pressure sensor are connected with the signal input end of the liquid level correction module, when the system runs, the engine oil level initial value calculation module firstly converts a signal acquired by the first pressure sensor into an engine oil level initial value in real time through a pre-calibrated pressure-liquid level MAP (MAP), then the liquid level correction module corrects the engine oil level initial value by combining the signal acquired by the second pressure sensor to obtain a corrected engine oil level value, this design not only carries out the calculation of machine oil liquid level through pressure sensor's pressure signal to revise the machine oil level value that obtains according to No. two pressure sensor's pressure signal, realized the accurate measurement of machine oil liquid level, it is with low costs moreover. Therefore, the invention not only realizes the accurate measurement of the oil level, but also has low cost.
2. The ECU control unit in the engine oil level monitoring system also comprises a delay filter module, wherein the signal input end of the delay filter module is connected with the signal output end of the liquid level correction module, when a vehicle runs on a bumpy road surface, the delay filter module can delay the corrected engine oil level value, namely, the average value of the corrected engine oil level value in a set time period is used as an output value, and the accuracy of engine oil level measurement under the working condition of the bumpy road surface is effectively improved. Therefore, the invention improves the accuracy of the engine oil level measurement under the working condition of bumpy road surfaces.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
FIG. 2 is a logic diagram for the operation of the present invention.
Fig. 3 shows the voltage-absolute pressure MAP according to example 1 of the present invention.
In the figure, an ECU (electronic control Unit) control unit 1, an engine oil liquid level initial value calculation module 11, a liquid level correction module 12, a delay filtering module 13, a liquid level alarm module 14, a first pressure sensor 2 and a second pressure sensor 3 are arranged.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, an engine oil level monitoring system comprises an ECU control unit 1 and a first pressure sensor 2 arranged at the bottom of an engine oil pan;
the monitoring system further comprises a second pressure sensor 3 arranged on the engine air valve chamber cover cap, the ECU control unit 1 comprises an engine oil liquid level initial value calculation module 11 and a liquid level correction module 12, the signal input end of the engine oil liquid level initial value calculation module 11 is connected with the signal output end of the first pressure sensor 2, and the signal output ends of the engine oil liquid level initial value calculation module 11 and the second pressure sensor 3 are connected with the signal input end of the liquid level correction module 12.
The ECU control unit 1 further comprises a delay filtering module 13, and a signal input end of the delay filtering module 13 is connected with a signal output end of the liquid level correction module 12.
The ECU control unit 1 further comprises a liquid level alarm module 14, wherein a signal input end of the liquid level alarm module 14 is connected with a signal output end of the delay filtering module 13;
the liquid level alarm module 14 is used for comparing the engine oil level output by the delay filter module 13 with an engine oil level alarm limit value in real time, sending an alarm prompt when the engine oil level is lower than a first gear alarm limit value, and sending an engine torque limiting prompt when the engine oil level is lower than a second gear alarm limit value.
The first pressure sensor 2 and the second pressure sensor 3 are both MEMS sensors.
Referring to fig. 2, an operation method of an oil level monitoring system sequentially includes the following steps:
step one, an engine oil liquid level initial value calculation module 11 converts a signal acquired by a first pressure sensor 2 in real time into an engine oil liquid level initial value through a pre-calibrated pressure-liquid level MAP;
and step two, the liquid level correction module 12 corrects the initial value of the oil liquid level by combining the signals collected by the second pressure sensor 3 to obtain the corrected oil liquid level value.
The second step is specifically as follows: the liquid level correction module 12 converts the voltage signal collected by the second pressure sensor 3 into an absolute pressure value through a pre-calibrated voltage-absolute pressure MAP, determines a liquid level correction amount according to the absolute pressure value, and finally takes the difference value between the initial value of the oil liquid level and the liquid level correction amount as a corrected oil liquid level value.
The ECU control unit 1 further comprises a delay filtering module 13, wherein a signal input end of the delay filtering module 13 is connected with a signal output end of the liquid level correction module 12;
the operation method further comprises the following steps:
and step three, when the vehicle runs on a bumpy road surface, the delay filtering module 13 carries out delay processing on the corrected oil level value, namely, the average value of the corrected oil level value in a set time period is used as an output value.
The ECU control unit 1 further comprises a liquid level alarm module 14, wherein a signal input end of the liquid level alarm module 14 is connected with a signal output end of the delay filtering module 13;
the operation method further comprises the following steps:
and step four, the liquid level alarm module 14 compares the output value of the delay filter module 13 with the engine oil liquid level alarm limit value in real time, sends out an alarm prompt when the oil liquid level is lower than the first gear alarm limit value, and sends out an engine torque limiting prompt when the oil liquid level is lower than the second gear alarm limit value.
The principle of the invention is illustrated as follows:
the invention provides an engine oil level monitoring system which comprises a first pressure sensor 2 at the bottom of an engine oil pan, a second pressure sensor 3 arranged on an air valve chamber cover communicated with the upper part of the oil level of the oil pan, wherein the first pressure sensor 2 and the second pressure sensor 3 are connected with an ECU (electronic control unit) 1 and powered by the ECU, the first pressure sensor 2 and the second pressure sensor 3 transmit a pressure signal at the bottom of the oil pan and a pressure signal of an air valve chamber cover crankcase on the upper surface of the oil level to the ECU 1 in real time, the ECU 1 carries out the calculation of an initial value of the oil level according to the pressure signal of the first pressure sensor 2 and the correction calculation of the oil level signal according to the pressure signal of the second pressure sensor 3, and the corrected calculated liquid level ensures the accuracy of the measurement of the liquid level of a bumpy road surface through delay filtering processing. And comparing the engine oil level after the correction filtering with an engine oil level alarm limit value, sending an alarm prompt when the engine oil level is lower than a first gear alarm limit value, and sending an engine torque limiting prompt when the engine oil level is lower than a second gear alarm limit value. Through the structure, the liquid level condition of the engine oil can be accurately monitored, a user is reminded of adding the engine oil in time, the service life of the engine is prolonged, excessive components do not need to be added, and the vehicle using experience of the user is improved to the maximum extent.
Example 1:
referring to fig. 1, an engine oil level monitoring system comprises an ECU control unit 1, a first pressure sensor 2 arranged at the bottom of an engine oil pan, and a second pressure sensor 3 arranged on a cover of an engine air valve chamber, wherein the first pressure sensor 2 and the second pressure sensor 3 are both MEMS sensors, the ECU control unit 1 comprises an engine oil level initial value calculation module 11 and a liquid level correction module 12, a signal input end of the engine oil level initial value calculation module 11 is connected with a signal output end of the first pressure sensor 2, and signal output ends of the engine oil level initial value calculation module 11 and the second pressure sensor 3 are connected with a signal input end of the liquid level correction module 12.
Referring to fig. 2, the operation method of the engine oil level monitoring system is sequentially performed according to the following steps:
1. the engine oil liquid level initial value calculation module 11 converts the signal acquired by the first pressure sensor 2 in real time into an engine oil liquid level initial value through a pre-calibrated pressure-liquid level MAP;
2. the liquid level correction module 12 corrects the initial value of the oil liquid level by combining the signal collected by the second pressure sensor 3 to obtain a corrected oil level value.
3. The liquid level correction module 12 converts the voltage signal acquired by the second pressure sensor 3 into an absolute pressure value through a voltage-absolute pressure MAP calibrated in advance as shown in fig. 3, determines a liquid level correction amount according to the absolute pressure value through P = ρ gh, and then takes a difference value between an oil level initial value and the liquid level correction amount as a corrected oil level value.
Example 2:
the difference from example 1 is that:
referring to fig. 1, the ECU control unit 1 further includes a delay filter module 13, and a signal input end of the delay filter module 13 is connected to a signal output end of the liquid level correction module 12.
The operation method further comprises the following steps:
4. when the vehicle runs on a bumpy road surface, the delay filtering module 13 carries out delay processing on the corrected oil level value, namely, the average value of the corrected oil level value in a set time period is used as an output value.
Example 3:
the difference from example 2 is that:
referring to fig. 1, the ECU control unit 1 further includes a liquid level alarm module 14, and a signal input end of the liquid level alarm module 14 is connected to a signal output end of the delay filter module 13;
the operation method further comprises the following steps:
5. the liquid level alarm module 14 compares the output value of the delay filter module 13 with an engine oil level alarm limit value in real time, gives an alarm prompt when the oil level is lower than the first gear alarm limit value, and sends an engine torque limiting prompt when the oil level is lower than the second gear alarm limit value.
Claims (8)
1. The utility model provides an engine oil liquid level monitoring system, includes ECU the control unit (1), sets up pressure sensor (2) in engine oil drain pan bottom, its characterized in that:
the monitoring system further comprises a second pressure sensor (3) arranged on the engine air valve chamber cover cap, the ECU control unit (1) comprises an engine oil liquid level initial value calculation module (11) and a liquid level correction module (12), the signal input end of the engine oil liquid level initial value calculation module (11) is connected with the signal output end of the first pressure sensor (2), and the signal output ends of the engine oil liquid level initial value calculation module (11) and the second pressure sensor (3) are connected with the signal input end of the liquid level correction module (12).
2. An engine oil level monitoring system according to claim 1, characterized in that: the ECU control unit (1) further comprises a delay filtering module (13), and the signal input end of the delay filtering module (13) is connected with the signal output end of the liquid level correction module (12).
3. An engine oil level monitoring system according to claim 2, characterized in that:
the ECU control unit (1) further comprises a liquid level alarm module (14), and the signal input end of the liquid level alarm module (14) is connected with the signal output end of the delay filtering module (13);
the liquid level alarm module (14) is used for comparing the engine oil liquid level output by the delay filter module (13) with an engine oil liquid level alarm limit value in real time, sending an alarm prompt when the engine oil liquid level is lower than a first gear alarm limit value, and sending an engine torque limiting prompt when the engine oil liquid level is lower than a second gear alarm limit value.
4. An engine oil level monitoring system according to any one of claims 1 to 3, characterized in that: the first pressure sensor (2) and the second pressure sensor (3) are MEMS sensors.
5. A method of operating the oil level monitoring system of claim 1, wherein:
the operation method sequentially comprises the following steps:
step one, an engine oil liquid level initial value calculation module (11) converts signals acquired by a first pressure sensor (2) in real time into an engine oil liquid level initial value through a pre-calibrated pressure-liquid level MAP;
and step two, the liquid level correction module (12) corrects the initial value of the oil liquid level by combining the signals collected by the second pressure sensor (3) to obtain the corrected oil liquid level value.
6. The method of claim 5, wherein the method comprises:
the second step is specifically as follows: the liquid level correction module (12) converts a voltage signal acquired by the second pressure sensor (3) into an absolute pressure value through a pre-calibrated voltage-absolute pressure MAP, determines a liquid level correction amount according to the absolute pressure value, and finally takes a difference value between an engine oil liquid level initial value and the liquid level correction amount as a corrected engine oil level value.
7. The method of claim 5, wherein the method comprises:
the ECU control unit (1) further comprises a delay filtering module (13), and the signal input end of the delay filtering module (13) is connected with the signal output end of the liquid level correction module (12);
the operation method further comprises the following steps:
and step three, when the vehicle runs on a bumpy road surface, the delay filtering module (13) carries out delay processing on the corrected oil level value, namely, the average value of the corrected oil level value in a set time period is used as an output value.
8. The method of claim 7, wherein the method comprises:
the ECU control unit (1) further comprises a liquid level alarm module (14), and the signal input end of the liquid level alarm module (14) is connected with the signal output end of the delay filtering module (13);
the operation method further comprises the following steps:
and step four, the liquid level alarm module (14) compares the output value of the delay filtering module (13) with the engine oil level alarm limit value in real time, sends out an alarm prompt when the engine oil level is lower than the first gear alarm limit value, and sends out an engine torque limiting prompt when the engine oil level is lower than the second gear alarm limit value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110748863.7A CN113356962A (en) | 2021-07-02 | 2021-07-02 | Engine oil liquid level monitoring system and operation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110748863.7A CN113356962A (en) | 2021-07-02 | 2021-07-02 | Engine oil liquid level monitoring system and operation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991906A (en) * | 2022-05-30 | 2022-09-02 | 中国第一汽车股份有限公司 | Method and device for monitoring engine oil amount, vehicle and electronic equipment |
| CN115326165A (en) * | 2022-10-12 | 2022-11-11 | 山东特联信息科技有限公司 | Tank car remote monitoring system |
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|---|---|---|---|---|
| JPH07310518A (en) * | 1994-05-16 | 1995-11-28 | Daihatsu Diesel Mfg Co Ltd | Measuring device for consumed quantity of lubricating oil for internal combustion engine |
| DE10061041A1 (en) * | 2000-12-08 | 2002-06-13 | Daimler Chrysler Ag | Method for determining the top-up quantity of oil for a motor vehicle engine that ensures a correct value is used by rejecting values where the variance of an average measurement is too high |
| CN104314640A (en) * | 2014-08-19 | 2015-01-28 | 奇瑞汽车股份有限公司 | Monitoring device for engine oil reserves of vehicle engine |
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2021
- 2021-07-02 CN CN202110748863.7A patent/CN113356962A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07310518A (en) * | 1994-05-16 | 1995-11-28 | Daihatsu Diesel Mfg Co Ltd | Measuring device for consumed quantity of lubricating oil for internal combustion engine |
| DE10061041A1 (en) * | 2000-12-08 | 2002-06-13 | Daimler Chrysler Ag | Method for determining the top-up quantity of oil for a motor vehicle engine that ensures a correct value is used by rejecting values where the variance of an average measurement is too high |
| CN104314640A (en) * | 2014-08-19 | 2015-01-28 | 奇瑞汽车股份有限公司 | Monitoring device for engine oil reserves of vehicle engine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991906A (en) * | 2022-05-30 | 2022-09-02 | 中国第一汽车股份有限公司 | Method and device for monitoring engine oil amount, vehicle and electronic equipment |
| CN114991906B (en) * | 2022-05-30 | 2024-01-05 | 中国第一汽车股份有限公司 | Engine oil quantity monitoring method and device, vehicle and electronic equipment |
| CN115326165A (en) * | 2022-10-12 | 2022-11-11 | 山东特联信息科技有限公司 | Tank car remote monitoring system |
| CN115326165B (en) * | 2022-10-12 | 2023-01-24 | 山东特联信息科技有限公司 | Tank car remote monitoring system |
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